Estimation of rake temperatures in free oblique cutting

Abstract

A model for analysing temperatures in free oblique cutting with sharp cutting tools is developed by utilising a recent solution for temperature distributions on a rectangular heat source moving obliquely on a semi-infinite conducting medium. The source obliquities introduced at the shear and rake planes by the tool obliquity are identified and a procedure is developed to compute the temperature distributions and heat partition coefficients at the shear and rake planes. For mild steel cut by a H.S.S. tool, the mean tool-chip interface temperature estimated by the new model is in close agreement with that measured by the tool-work thermocouple method. It is noted that the introduction of tool obliquity results in temperature and heat partition coefficient distributions which are essentially similar to those obtained in orthogonal cutting. The mean tool-chip interface temperature is found to decrease with increasing tool obliquity.